Mysterious JQuery attribute

I've come across a piece of code that utilizes an unfamiliar selector that I can't seem to figure out:

$("div[tag=" + someVariable + "]").css("display", "block");

From what I gather, the selector is searching for a div element with an attribute named tag, where the value matches someVariable.

What exactly is the purpose of the tag attribute? Despite numerous Google searches, I haven't found any clear answers.

EDIT: Here's another line of code:

$("div[tag=" + someVariable+ "]").addClass("someClass");

Is it possible that this code snippet generates a new div with a custom attribute, and then appends it to the content?

jqueryhtmlcssdom

Answer №1

Although custom-defined attributes are not in line with the HTML spec, most browsers do not impose any restrictions on them.

The individual who designed this HTML has code that resembles:

<div tag="something">

In HTML5 (which achieved "recommendation" status in Oct of 2014), custom tags are supported by prefixing them with "data-" (learn more). So, technically, it would have been more appropriate to write it as:

<div data-tag="something">

and

$("div[data-tag=" + someVariable + "]")

Answer №2

Feel free to get creative with your attribute names, you can even go wild and name them something like funkyweirdname - just keep in mind that it may not be recommended and could fail any validation checks. It is generally suggested to use data-{tag} format for attributes that you define yourself. However, there is no strict rule against using tag as an attribute name if you or the script developers prefer it. It is worth noting that tag is not a standard tag in HTML.

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